Thermals wouldn’t get too hot, but wireless charging is terribly inefficient. If using a battery pack that’s say 20,000mah in size, you’ll only normally get about 14,000mah worth of charge into your device going from USB C to USB C (caries with charge speed and efficiency of charge controllers involved). With wireless charging you’re probably looking at 9,000mah.
Thermals wouldn’t get too hot, but wireless charging is terribly inefficient. If using a battery pack that’s say 20,000mah in size, you’ll only normally get about 14,000mah worth of charge into your device going from USB C to USB C (caries with charge speed and efficiency of charge controllers involved). With wireless charging you’re probably looking at 9,000mah.